#JavaScript (Using external library - Enumerable) ((削除) 90 (削除ここまで)(削除) 88 (削除ここまで)(削除) 86 (削除ここまで) 80 bytes)

Link to lib: https://github.com/mvegh1/Enumerable

(z=_.Range)(0,26).WriteLine(x=>z(x*x,2*x+1).Write("",y=>(y%26+10).toString(36)))

Code explanation: Create range of ints 0 to 25, and for each write a new line according to the predicate. For each line, create a range of ints starting at the square of the current int, for a count of 2x+1. Then take that range, and join it into a string delimited by nothing where each int is casted to the String represented by the int ascii code

enter image description here

JavaScript (Using external library - Enumerable) ((削除) 90 (削除ここまで)(削除) 88 (削除ここまで)(削除) 86 (削除ここまで) 80 bytes)

Link to lib: https://github.com/mvegh1/Enumerable

(z=_.Range)(0,26).WriteLine(x=>z(x*x,2*x+1).Write("",y=>(y%26+10).toString(36)))

Code explanation: Create range of ints 0 to 25, and for each write a new line according to the predicate. For each line, create a range of ints starting at the square of the current int, for a count of 2x+1. Then take that range, and join it into a string delimited by nothing where each int is casted to the String represented by the int ascii code

enter image description here

#JavaScript (Using external library - Enumerable) ((削除) 90 (削除ここまで) (削除) 88 (削除ここまで) 86 bytes)

Link to lib: https://github.com/mvegh1/Enumerable

(z=_.Range)(0,26).WriteLine(x=>z(x*x,2*x+1).Write("",y=>String.fromCharCode(y%26+65)))

Code explanation: Create range of ints 0 to 25, and for each write a new line according to the predicate. For each line, create a range of ints starting at the square of the current int, for a count of 2x+1. Then take that range, and join it into a string delimited by nothing where each int is casted to the String represented by the int ascii code

enter image description here

#JavaScript (Using external library - Enumerable) ((削除) 90 (削除ここまで) (削除) 88 (削除ここまで) (削除) 86 (削除ここまで) 80 bytes)

Link to lib: https://github.com/mvegh1/Enumerable

(z=_.Range)(0,26).WriteLine(x=>z(x*x,2*x+1).Write("",y=>(y%26+10).toString(36)))

Code explanation: Create range of ints 0 to 25, and for each write a new line according to the predicate. For each line, create a range of ints starting at the square of the current int, for a count of 2x+1. Then take that range, and join it into a string delimited by nothing where each int is casted to the String represented by the int ascii code

enter image description here